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Genetics

Genetics. Beyond Dominant and Recessive: Incomplete Dominance, Codominance , Multiple alleles, Polygenic Traits. Dominant and Recessive. Up till now, we have been talking ONLY about Dominant and Recessive alleles.

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Genetics

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  1. Genetics Beyond Dominant and Recessive: Incomplete Dominance, Codominance, Multiple alleles, Polygenic Traits

  2. Dominant and Recessive • Up till now, we have been talking ONLY about Dominant and Recessive alleles. • What happens when alleles aren’t dominant and recessive? Or when there is more than one allele?

  3. What about this? • Two different letters • “R” and “W” • Red “RR” • White “WW” • Two Pure-breds create an intermediary • “RW” = Pink

  4. Incomplete Dominance • Neither allele is dominant • Heterozygous phenotype is an intermediary • Somewhere in between the pure-breds

  5. What about this? • Roan cow has two different colors of fur at the same time.

  6. Codominance • Both alleles are dominant • Both alleles show up. • In a Roan cow, there are red hairs and white hairs • In a flower, both colors show up in the flower.

  7. What about this? • More than 2 colors are possible. (Four in rabbits)

  8. Multiple Alleles • More than 2 alleles exist (in the population) • Only 2 alleles are inherited from the parents

  9. What about this? • Skin color is controlled by two or more genes– NOT just alleles! • There are SO many different colors of skin.

  10. Polygenic Traits • “Poly” = Many • “Genic” = Genes • Wide range of phenotypes – many genes contribute. • Eye color (dark, light, separate eyes)

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